George, you and I are on parallel paths with our systems it seems.
I went through all of these considerations about Bluray players, installing Plex and so on... I'm also upgrading subs, improving bass traps, etc.

It all started with a new Yamaha RX A4A receiver.. then it was new surrounds, then re-mounting the rears higher, then new center channel... now I'm going to pickup new subs down in Florida (Rhythmik 15's).. I also re-did bass traps in the front corners with an old Tempurpedic mattress, which is incredibly powerful, btw.
I have a Yamaha Bluray player now.. bd-s681 - I got a refurbished unit.. well 2, actually.. first wouldn't power back on. It's so old it has a front display! Looks and sounds very good to me. Not 'omg' like the 820 probably is.. but I wanted it as a multi-format player. Video is as-good-as the Samsung it replaced, maybe better. I didn't want a 'smart' device as my player. I have a Roku for that.
I tried using Plex but compressing the audio defeats the purpose of my main goal which was to get as high-rez as possible sound. I plan to compare using some blu-ray concerts. But so far I just get sucked into the music/performance when I play them so I can't get into 'analysis mode'. Maybe I'll never compare it because I just enjoy what I have so much... Plus, converting my DVD's to Plex is a chore I don't enjoy... I think I'm doing it wrong.
In my room, I have 1 big custom 15" sealed sub w/ 1000w amp that Richidoo made for me. Because of my system configuration/locations, it has been a dedicated HT sub. One night I was playing Pandora through the Roku.. hearing familiar songs with the sub on.. in surround sound... I was like, whoa! There's all this new sound I hadn't heard before.. That sub adds a lot I hadn't realized was in the music... and this is on streaming Pandora... Imagine listening to FLAC or WAV on a killer DAC ... with a sub.... or even 2 subs? It took like 10 minutes before I HAD to have music subs.
The Yamaha DACs are not bad.. and the surround processing is great... I'm loving the 8 year refresh!

But... as to Bluray players... First, decide if you want it to do more than play discs, and what format. For me, I don't see the point in using a player as an application manager.. Nvidia Shield, Roku, or HTPC make way better choices. I picked Roku.... Even a Playstation or XBOX would be better than using a player. Once you make that choice, the Panny 820 is the best for the money, unless you want a CD player/transport too, then I think the 9000 is a good choice. For me, I got a mix of those with the old Yamaha, and compromised a little on video quality.. since I have a 1080P projector.
Another thing to consider is if you always have a monitor on... I don't. The screen comes down and I use a projector.. so if I have to use a menu, then I gotta turn on all that crap. Not many people use projectors these days... it seems.
Man I'm so excited about getting the subs. Just wanted to participate here today to release a little audio-nerd energy... thanks!
